3 * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
4 * For use with Cypress Txx3xx parts.
5 * Supported parts include:
9 * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
10 * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * version 2, and only version 2, as published by the
15 * Free Software Foundation.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26 * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
30 #include <linux/delay.h>
31 #include <linux/input.h>
32 #include <linux/input/mt.h>
33 #include <linux/gpio.h>
34 #include <linux/interrupt.h>
35 #include <linux/slab.h>
37 #include "cyttsp_core.h"
39 /* Bootloader number of command keys */
40 #define CY_NUM_BL_KEYS 8
43 #define GET_NUM_TOUCHES(x) ((x) & 0x0F)
44 #define IS_LARGE_AREA(x) (((x) & 0x10) >> 4)
45 #define IS_BAD_PKT(x) ((x) & 0x20)
46 #define IS_VALID_APP(x) ((x) & 0x01)
47 #define IS_OPERATIONAL_ERR(x) ((x) & 0x3F)
48 #define GET_HSTMODE(reg) (((reg) & 0x70) >> 4)
49 #define GET_BOOTLOADERMODE(reg) (((reg) & 0x10) >> 4)
51 #define CY_REG_BASE 0x00
52 #define CY_REG_ACT_DIST 0x1E
53 #define CY_REG_ACT_INTRVL 0x1D
54 #define CY_REG_TCH_TMOUT (CY_REG_ACT_INTRVL + 1)
55 #define CY_REG_LP_INTRVL (CY_REG_TCH_TMOUT + 1)
57 #define CY_DELAY_DFLT 20 /* ms */
58 #define CY_DELAY_MAX 500
59 #define CY_ACT_DIST_DFLT 0xF8
60 #define CY_HNDSHK_BIT 0x80
61 /* device mode bits */
62 #define CY_OPERATE_MODE 0x00
63 #define CY_SYSINFO_MODE 0x10
64 /* power mode select bits */
65 #define CY_SOFT_RESET_MODE 0x01 /* return to Bootloader mode */
66 #define CY_DEEP_SLEEP_MODE 0x02
67 #define CY_LOW_POWER_MODE 0x04
69 /* Slots management */
70 #define CY_MAX_FINGER 4
73 static const u8 bl_command[] = {
74 0x00, /* file offset */
76 0xA5, /* exit bootloader command */
77 0, 1, 2, 3, 4, 5, 6, 7 /* default keys */
80 static int ttsp_read_block_data(struct cyttsp *ts, u8 command,
86 for (tries = 0; tries < CY_NUM_RETRY; tries++) {
87 error = ts->bus_ops->read(ts->dev, ts->xfer_buf, command,
92 msleep(CY_DELAY_DFLT);
98 static int ttsp_write_block_data(struct cyttsp *ts, u8 command,
104 for (tries = 0; tries < CY_NUM_RETRY; tries++) {
105 error = ts->bus_ops->write(ts->dev, ts->xfer_buf, command,
110 msleep(CY_DELAY_DFLT);
116 static int ttsp_send_command(struct cyttsp *ts, u8 cmd)
118 return ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
121 static int cyttsp_load_bl_regs(struct cyttsp *ts)
123 memset(&ts->bl_data, 0, sizeof(ts->bl_data));
124 ts->bl_data.bl_status = 0x10;
126 return ttsp_read_block_data(ts, CY_REG_BASE,
127 sizeof(ts->bl_data), &ts->bl_data);
130 static int cyttsp_exit_bl_mode(struct cyttsp *ts)
133 u8 bl_cmd[sizeof(bl_command)];
135 memcpy(bl_cmd, bl_command, sizeof(bl_command));
136 if (ts->pdata->bl_keys)
137 memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
138 ts->pdata->bl_keys, sizeof(bl_command));
140 error = ttsp_write_block_data(ts, CY_REG_BASE,
141 sizeof(bl_cmd), bl_cmd);
145 /* wait for TTSP Device to complete the operation */
146 msleep(CY_DELAY_DFLT);
148 error = cyttsp_load_bl_regs(ts);
152 if (GET_BOOTLOADERMODE(ts->bl_data.bl_status))
158 static int cyttsp_set_operational_mode(struct cyttsp *ts)
162 error = ttsp_send_command(ts, CY_OPERATE_MODE);
166 /* wait for TTSP Device to complete switch to Operational mode */
167 error = ttsp_read_block_data(ts, CY_REG_BASE,
168 sizeof(ts->xy_data), &ts->xy_data);
172 return ts->xy_data.act_dist == CY_ACT_DIST_DFLT ? -EIO : 0;
175 static int cyttsp_set_sysinfo_mode(struct cyttsp *ts)
179 memset(&ts->sysinfo_data, 0, sizeof(ts->sysinfo_data));
181 /* switch to sysinfo mode */
182 error = ttsp_send_command(ts, CY_SYSINFO_MODE);
186 /* read sysinfo registers */
187 msleep(CY_DELAY_DFLT);
188 error = ttsp_read_block_data(ts, CY_REG_BASE, sizeof(ts->sysinfo_data),
193 if (!ts->sysinfo_data.tts_verh && !ts->sysinfo_data.tts_verl)
199 static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
203 if (ts->pdata->act_intrvl != CY_ACT_INTRVL_DFLT ||
204 ts->pdata->tch_tmout != CY_TCH_TMOUT_DFLT ||
205 ts->pdata->lp_intrvl != CY_LP_INTRVL_DFLT) {
208 ts->pdata->act_intrvl,
209 ts->pdata->tch_tmout,
213 /* set intrvl registers */
214 retval = ttsp_write_block_data(ts, CY_REG_ACT_INTRVL,
215 sizeof(intrvl_ray), intrvl_ray);
216 msleep(CY_DELAY_DFLT);
222 static int cyttsp_soft_reset(struct cyttsp *ts)
224 unsigned long timeout;
227 /* wait for interrupt to set ready completion */
228 INIT_COMPLETION(ts->bl_ready);
229 ts->state = CY_BL_STATE;
233 retval = ttsp_send_command(ts, CY_SOFT_RESET_MODE);
237 timeout = wait_for_completion_timeout(&ts->bl_ready,
238 msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX));
239 retval = timeout ? 0 : -EIO;
242 ts->state = CY_IDLE_STATE;
243 disable_irq(ts->irq);
247 static int cyttsp_act_dist_setup(struct cyttsp *ts)
249 u8 act_dist_setup = ts->pdata->act_dist;
251 /* Init gesture; active distance setup */
252 return ttsp_write_block_data(ts, CY_REG_ACT_DIST,
253 sizeof(act_dist_setup), &act_dist_setup);
256 static void cyttsp_extract_track_ids(struct cyttsp_xydata *xy_data, int *ids)
258 ids[0] = xy_data->touch12_id >> 4;
259 ids[1] = xy_data->touch12_id & 0xF;
260 ids[2] = xy_data->touch34_id >> 4;
261 ids[3] = xy_data->touch34_id & 0xF;
264 static const struct cyttsp_tch *cyttsp_get_tch(struct cyttsp_xydata *xy_data,
269 return &xy_data->tch1;
271 return &xy_data->tch2;
273 return &xy_data->tch3;
275 return &xy_data->tch4;
281 static void cyttsp_report_tchdata(struct cyttsp *ts)
283 struct cyttsp_xydata *xy_data = &ts->xy_data;
284 struct input_dev *input = ts->input;
285 int num_tch = GET_NUM_TOUCHES(xy_data->tt_stat);
286 const struct cyttsp_tch *tch;
289 DECLARE_BITMAP(used, CY_MAX_ID);
291 if (IS_LARGE_AREA(xy_data->tt_stat) == 1) {
292 /* terminate all active tracks */
294 dev_dbg(ts->dev, "%s: Large area detected\n", __func__);
295 } else if (num_tch > CY_MAX_FINGER) {
296 /* terminate all active tracks */
298 dev_dbg(ts->dev, "%s: Num touch error detected\n", __func__);
299 } else if (IS_BAD_PKT(xy_data->tt_mode)) {
300 /* terminate all active tracks */
302 dev_dbg(ts->dev, "%s: Invalid buffer detected\n", __func__);
305 cyttsp_extract_track_ids(xy_data, ids);
307 bitmap_zero(used, CY_MAX_ID);
309 for (i = 0; i < num_tch; i++) {
310 tch = cyttsp_get_tch(xy_data, i);
312 input_mt_slot(input, ids[i]);
313 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
314 input_report_abs(input, ABS_MT_POSITION_X, be16_to_cpu(tch->x));
315 input_report_abs(input, ABS_MT_POSITION_Y, be16_to_cpu(tch->y));
316 input_report_abs(input, ABS_MT_TOUCH_MAJOR, tch->z);
318 __set_bit(ids[i], used);
321 for (i = 0; i < CY_MAX_ID; i++) {
322 if (test_bit(i, used))
325 input_mt_slot(input, i);
326 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
332 static irqreturn_t cyttsp_irq(int irq, void *handle)
334 struct cyttsp *ts = handle;
337 if (unlikely(ts->state == CY_BL_STATE)) {
338 complete(&ts->bl_ready);
342 /* Get touch data from CYTTSP device */
343 error = ttsp_read_block_data(ts, CY_REG_BASE,
344 sizeof(struct cyttsp_xydata), &ts->xy_data);
348 /* provide flow control handshake */
349 if (ts->pdata->use_hndshk) {
350 error = ttsp_send_command(ts,
351 ts->xy_data.hst_mode ^ CY_HNDSHK_BIT);
356 if (unlikely(ts->state == CY_IDLE_STATE))
359 if (GET_BOOTLOADERMODE(ts->xy_data.tt_mode)) {
361 * TTSP device has reset back to bootloader mode.
362 * Restore to operational mode.
364 error = cyttsp_exit_bl_mode(ts);
367 "Could not return to operational mode, err: %d\n",
369 ts->state = CY_IDLE_STATE;
372 cyttsp_report_tchdata(ts);
379 static int cyttsp_power_on(struct cyttsp *ts)
383 error = cyttsp_soft_reset(ts);
387 error = cyttsp_load_bl_regs(ts);
391 if (GET_BOOTLOADERMODE(ts->bl_data.bl_status) &&
392 IS_VALID_APP(ts->bl_data.bl_status)) {
393 error = cyttsp_exit_bl_mode(ts);
398 if (GET_HSTMODE(ts->bl_data.bl_file) != CY_OPERATE_MODE ||
399 IS_OPERATIONAL_ERR(ts->bl_data.bl_status)) {
403 error = cyttsp_set_sysinfo_mode(ts);
407 error = cyttsp_set_sysinfo_regs(ts);
411 error = cyttsp_set_operational_mode(ts);
415 /* init active distance */
416 error = cyttsp_act_dist_setup(ts);
420 ts->state = CY_ACTIVE_STATE;
425 static int cyttsp_enable(struct cyttsp *ts)
430 * The device firmware can wake on an I2C or SPI memory slave
431 * address match. So just reading a register is sufficient to
432 * wake up the device. The first read attempt will fail but it
433 * will wake it up making the second read attempt successful.
435 error = ttsp_read_block_data(ts, CY_REG_BASE,
436 sizeof(ts->xy_data), &ts->xy_data);
440 if (GET_HSTMODE(ts->xy_data.hst_mode))
448 static int cyttsp_disable(struct cyttsp *ts)
452 error = ttsp_send_command(ts, CY_LOW_POWER_MODE);
456 disable_irq(ts->irq);
461 #ifdef CONFIG_PM_SLEEP
462 static int cyttsp_suspend(struct device *dev)
464 struct cyttsp *ts = dev_get_drvdata(dev);
467 mutex_lock(&ts->input->mutex);
469 if (ts->input->users) {
470 retval = cyttsp_disable(ts);
472 ts->suspended = true;
475 mutex_unlock(&ts->input->mutex);
480 static int cyttsp_resume(struct device *dev)
482 struct cyttsp *ts = dev_get_drvdata(dev);
484 mutex_lock(&ts->input->mutex);
486 if (ts->input->users)
489 ts->suspended = false;
491 mutex_unlock(&ts->input->mutex);
498 SIMPLE_DEV_PM_OPS(cyttsp_pm_ops, cyttsp_suspend, cyttsp_resume);
499 EXPORT_SYMBOL_GPL(cyttsp_pm_ops);
501 static int cyttsp_open(struct input_dev *dev)
503 struct cyttsp *ts = input_get_drvdata(dev);
507 retval = cyttsp_enable(ts);
512 static void cyttsp_close(struct input_dev *dev)
514 struct cyttsp *ts = input_get_drvdata(dev);
520 struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
521 struct device *dev, int irq, size_t xfer_buf_size)
523 const struct cyttsp_platform_data *pdata = dev->platform_data;
525 struct input_dev *input_dev;
528 if (!pdata || !pdata->name || irq <= 0) {
533 ts = kzalloc(sizeof(*ts) + xfer_buf_size, GFP_KERNEL);
534 input_dev = input_allocate_device();
535 if (!ts || !input_dev) {
541 ts->input = input_dev;
542 ts->pdata = dev->platform_data;
543 ts->bus_ops = bus_ops;
546 init_completion(&ts->bl_ready);
547 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
550 error = pdata->init();
552 dev_err(ts->dev, "platform init failed, err: %d\n",
558 input_dev->name = pdata->name;
559 input_dev->phys = ts->phys;
560 input_dev->id.bustype = bus_ops->bustype;
561 input_dev->dev.parent = ts->dev;
563 input_dev->open = cyttsp_open;
564 input_dev->close = cyttsp_close;
566 input_set_drvdata(input_dev, ts);
568 __set_bit(EV_ABS, input_dev->evbit);
569 input_set_abs_params(input_dev, ABS_MT_POSITION_X,
570 0, pdata->maxx, 0, 0);
571 input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
572 0, pdata->maxy, 0, 0);
573 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
576 input_mt_init_slots(input_dev, CY_MAX_ID, 0);
578 error = request_threaded_irq(ts->irq, NULL, cyttsp_irq,
579 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
582 dev_err(ts->dev, "failed to request IRQ %d, err: %d\n",
584 goto err_platform_exit;
587 disable_irq(ts->irq);
589 error = cyttsp_power_on(ts);
593 error = input_register_device(input_dev);
595 dev_err(ts->dev, "failed to register input device: %d\n",
603 free_irq(ts->irq, ts);
608 input_free_device(input_dev);
611 return ERR_PTR(error);
613 EXPORT_SYMBOL_GPL(cyttsp_probe);
615 void cyttsp_remove(struct cyttsp *ts)
617 free_irq(ts->irq, ts);
618 input_unregister_device(ts->input);
623 EXPORT_SYMBOL_GPL(cyttsp_remove);
625 MODULE_LICENSE("GPL");
626 MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver core");
627 MODULE_AUTHOR("Cypress");